PHP image uploader rename image?

Question

I'm trying to rename an image when uploading it to my server. Is there generally an easy way of doing this? Below is the php code I'm using. I want to rename it as a variable I'm passing through as a hidden field from a html form.

 //variable from hidden field on form which is from mysql database
 $imageName = $_POST['image_rename'];

 if ((($_FILES["file"]["type"] == "image/gif") || ($_FILES["file"]["type"] == "image/jpeg") || ($_FILES["file"]["type"] == "image/jpg") || ($_FILES["file"]["type"] == "image/pjpeg")) && ($_FILES["file"]["size"] < 8000000))
   {
   if ($_FILES["file"]["error"] > 0)
     {
     echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
     }
   else
     {
     echo "Upload: " . $_FILES["file"]["name"] . "<br />";
     echo "Type: " . $_FILES["file"]["type"] . "<br />";
     echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
     echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />";

     if (file_exists("../uploads/" . $_FILES["file"]["name"]))
       {
       echo $_FILES["file"]["name"] . " already exists. ";
       }
     else
       {
       move_uploaded_file($_FILES["file"]["tmp_name"], "../uploads/" . $_FILES["file"]["name"]);
       echo "Stored in: " . "../uploads/" . $_FILES["file"]["name"];
       }
     }
   }
 else
   {
   echo "Invalid file";
   }

Answer 1

Try changing the move_uploaded_file() function; add the name you want within the function. Just make sure to grab the proper extension, something like:

$parts=explode('.',$_FILES['file']['name']);
$newName=$imageName.'.'.$parts[(count($parts)-1)];
move_uploaded_file($_FILES['file']['tmp_name'],'../uploads/'.$newName);

Answer 2

Change

 move_uploaded_file($_FILES["file"]["tmp_name"], "../uploads/" . $_FILES["file"]["name"]);

to

 move_uploaded_file($_FILES["file"]["tmp_name"], "../uploads/" . $imageName);